7 //ZDC part -------------------------------------------------------------------
9 static const Float_t G1=20.03;
10 static const Float_t FDIP=-37.34;
11 static const Float_t FDIMU=6.;
12 static const Float_t FCORN=11.72;
14 // ZBEG Beginning of the inner triplet
15 // D1BEG Beginning of separator dipole 1
16 // D2BEG Beginning of separator dipole 2
17 // CORBEG Corrector dipole beginning (because of dimuon arm)
19 static const Float_t CORBEG=1920,COREND=CORBEG+190, CORRA2=4.5*4.5;
21 static const Float_t ZBEG=2300;
22 static const Float_t Z1BEG=ZBEG+ 0,Z1END=Z1BEG+630,Z1RA2=3.5*3.5;
23 static const Float_t Z2BEG=ZBEG+ 880,Z2END=Z2BEG+550,Z2RA2=3.5*3.5;
24 static const Float_t Z3BEG=ZBEG+1530,Z3END=Z3BEG+550,Z3RA2=3.5*3.5;
25 static const Float_t Z4BEG=ZBEG+2430,Z4END=Z4BEG+630,Z4RA2=3.5*3.5;
26 static const Float_t D1BEG=5843.5 ,D1END=D1BEG+945,D1RA2=4.5*4.5;
27 static const Float_t D2BEG=12113.2 ,D2END=D2BEG+945,D2RA2=4.5*.5;
29 //ZDC part -------------------------------------------------------------------
33 //________________________________________
34 AliMagF::AliMagF(const char *name, const char *title, const Int_t integ, const Int_t map,
35 const Float_t factor, const Float_t fmax)
45 //________________________________________
46 void AliMagF::Field(Float_t*, Float_t *b)
48 printf("Undefined MagF Field called, returning 0\n");
54 //________________________________________
55 AliMagFC::AliMagFC(const char *name, const char *title, const Int_t integ, const Int_t map,
56 const Float_t factor, const Float_t fmax)
57 : AliMagF(name,title,integ,map,factor,fmax)
59 printf("Constant Field %s created: map= %d, factor= %f\n",fName.Data(),map,factor);
63 //________________________________________
64 void AliMagFC::Field(Float_t *x, Float_t *b)
68 if(TMath::Abs(x[2])<700 && x[0]*x[0]+(x[1]+30)*(x[1]+30) < 560*560) {
71 if ( 725 <= x[2] && x[2] <= 1225 ) {
72 Float_t dz = TMath::Abs(975-x[2])*0.01;
76 //This is the ZDC part
77 Float_t rad2=x[0]*x[0]+x[1]*x[1];
81 // Separator Dipole D2
82 if(x[2]<D2END) b[1]=FDIP;
83 } else if(x[2]>D1BEG) {
85 // Separator Dipole D1
86 if(x[2]<D1END) b[1]=-FDIP;
90 // First quadrupole of inner triplet de-focussing in x-direction
99 } else if(x[2]>Z3BEG) {
106 } else if(x[2]>Z2BEG) {
113 } else if(x[2]>Z1BEG) {
120 } else if(x[2]>CORBEG) {
122 // Corrector dipole (because of dimuon arm)
131 printf("Invalid field map for constant field %d\n",fMap);
138 //________________________________________
139 AliMagFCM::AliMagFCM(const char *name, const char *title, const Int_t integ, const Int_t map,
140 const Float_t factor, const Float_t fmax)
141 : AliMagF(name,title,integ,map,factor,fmax)
144 printf("Constant Mesh Field %s created: map= %d, factor= %f, file= %s\n",fName.Data(),map,factor,fTitle.Data());
147 //________________________________________
148 void AliMagFCM::Field(Float_t *x, Float_t *b)
150 Double_t ratx, raty, ratz, hix, hiy, hiz, ratx1, raty1, ratz1,
151 bhyhz, bhylz, blyhz, blylz, bhz, blz, xl[3];
152 const Double_t one=1;
155 // --- find the position in the grid ---
158 if(-700<x[2] && x[2]<fZbeg && x[0]*x[0]+(x[1]+30)*(x[1]+30) < 560*560) {
161 if(fZbeg<=x[2] && x[2]<fZbeg+fZdel*(fZn-1)
162 && ( fXbeg <= TMath::Abs(x[0]) && TMath::Abs(x[0]) < fXbeg+fXdel*(fXn-1) )
163 && ( fYbeg <= TMath::Abs(x[1]) && TMath::Abs(x[1]) < fYbeg+fYdel*(fYn-1) )) {
164 xl[0]=TMath::Abs(x[0])-fXbeg;
165 xl[1]=TMath::Abs(x[1])-fYbeg;
183 // ... simple interpolation
187 bhyhz = Bx(ix ,iy+1,iz+1)*ratx1+Bx(ix+1,iy+1,iz+1)*ratx;
188 bhylz = Bx(ix ,iy+1,iz )*ratx1+Bx(ix+1,iy+1,iz )*ratx;
189 blyhz = Bx(ix ,iy ,iz+1)*ratx1+Bx(ix+1,iy ,iz+1)*ratx;
190 blylz = Bx(ix ,iy ,iz )*ratx1+Bx(ix+1,iy ,iz )*ratx;
191 bhz = blyhz *raty1+bhyhz *raty;
192 blz = blylz *raty1+bhylz *raty;
193 b[0] = blz *ratz1+bhz *ratz;
195 bhyhz = By(ix ,iy+1,iz+1)*ratx1+By(ix+1,iy+1,iz+1)*ratx;
196 bhylz = By(ix ,iy+1,iz )*ratx1+By(ix+1,iy+1,iz )*ratx;
197 blyhz = By(ix ,iy ,iz+1)*ratx1+By(ix+1,iy ,iz+1)*ratx;
198 blylz = By(ix ,iy ,iz )*ratx1+By(ix+1,iy ,iz )*ratx;
199 bhz = blyhz *raty1+bhyhz *raty;
200 blz = blylz *raty1+bhylz *raty;
201 b[1] = blz *ratz1+bhz *ratz;
203 bhyhz = Bz(ix ,iy+1,iz+1)*ratx1+Bz(ix+1,iy+1,iz+1)*ratx;
204 bhylz = Bz(ix ,iy+1,iz )*ratx1+Bz(ix+1,iy+1,iz )*ratx;
205 blyhz = Bz(ix ,iy ,iz+1)*ratx1+Bz(ix+1,iy ,iz+1)*ratx;
206 blylz = Bz(ix ,iy ,iz )*ratx1+Bz(ix+1,iy ,iz )*ratx;
207 bhz = blyhz *raty1+bhyhz *raty;
208 blz = blylz *raty1+bhylz *raty;
209 b[2] = blz *ratz1+bhz *ratz;
210 //printf("ratx,raty,ratz,b[0],b[1],b[2] %f %f %f %f %f %f\n",
211 //ratx,raty,ratz,b[0],b[1],b[2]);
213 // ... use the dipole symmetry
214 if (x[0]*x[1] < 0) b[1]=-b[1];
215 if (x[0]<0) b[2]=-b[2];
217 printf("Invalid field map for constant mesh %d\n",fMap);
220 //This is the ZDC part
221 Float_t rad2=x[0]*x[0]+x[1]*x[1];
225 // Separator Dipole D2
226 if(x[2]<D2END) b[1]=FDIP;
227 } else if(x[2]>D1BEG) {
229 // Separator Dipole D1
230 if(x[2]<D1END) b[1]=-FDIP;
234 // First quadrupole of inner triplet de-focussing in x-direction
243 } else if(x[2]>Z3BEG) {
250 } else if(x[2]>Z2BEG) {
257 } else if(x[2]>Z1BEG) {
264 } else if(x[2]>CORBEG) {
266 // Corrector dipole (because of dimuon arm)
276 //________________________________________
277 void AliMagFCM::ReadField()
280 Int_t ix, iy, iz, ipx, ipy, ipz;
283 printf("Reading Magnetic Field %s from file %s\n",fName.Data(),fTitle.Data());
284 fname = gSystem->ExpandPathName(fTitle.Data());
285 magfile=fopen(fname,"r");
288 fscanf(magfile,"%d %d %d %f %f %f %f %f %f",
289 &fXn, &fYn, &fZn, &fXdel, &fYdel, &fZdel, &fXbeg, &fYbeg, &fZbeg);
290 printf("fXn %d, fYn %d, fZn %d, fXdel %f, fYdel %f, fZdel %f, fXbeg %f, fYbeg %f, fZbeg %f\n",
291 fXn, fYn, fZn, fXdel, fYdel, fZdel, fXbeg, fYbeg, fZbeg);
295 fB = new TVector(3*fXn*fYn*fZn);
296 for (iz=0; iz<fZn; iz++) {
298 for (iy=0; iy<fYn; iy++) {
300 for (ix=0; ix<fXn; ix++) {
302 fscanf(magfile,"%f %f %f",&bz,&by,&bx);
310 printf("File %s not found !\n",fTitle.Data());